Issue with flush when implementing a NullableSetEditor by wrapping a NullalbleListEditor

[Jeff]

HI, 

I spent a lot of time on the following issue but couldn't figure it out. 
Any clue is appreciated. Thanks!

I have a working NullableStringListEditor implementation:
public class NullableStringListEditor extends Composite implements 
IsEditor<OptionalFieldEditor< List<String>, ListEditor<String, 
StringEditor> >> {...}
    
Now, I am building a NullableStringSetEditor by wrapping it. With the 
following implementation, values are displayed by the wrapped editor 
successfully, however any modifications(the NullableStringListEditor 
supports edit/add strings) are not reflected after flush(). I am using 
SimpleBeanEditorDriver. I debugged into it and it looks like the underline 
values(List) in the wrappedEditor(NullableStringListEditor) have been 
changed, but they are not populated to NullableStringSetEditor. Am I still 
missing something?

public class NullableStringSetEditor extends Composite implements 
CompositeEditor<Set<String>, List<String>, ListEditor<String, 
StringEditor>>, LeafValueEditor<Set<String>> {
    private final NullableStringListEditor wrappedEditor = new 
NullableStringListEditor();

    @Override
    public void 
setEditorChain(com.google.gwt.editor.client.CompositeEditor.EditorChain<List<String>,
 
ListEditor<String, StringEditor>> chain) {
        wrappedEditor.asEditor().setEditorChain(chain);                    
    }

    @Override
    public Set<String> getValue() {
        List<String> list = wrappedEditor.asEditor().getValue();
        return (list != null) ? new TreeSet<String>(list) : null;
    }

    @Override
    public void setValue(Set<String> values) {
        List<String> list = new ArrayList<String>();
        list.addAll(values);
        wrappedEditor.asEditor().setValue(list);
   }

   //no-op implementation for other required @Override such as flush() and 
setDelegate(EditorDelegate<Set<String>> delegate)
   //...
}

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